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Qu'est-ce (qui) est cyclometer$18410$ - définition
Cyclometer
![Reconstruction of appearance of cyclometer, based on sketches in [[Marian Rejewski]]'s memoirs](https://commons.wikimedia.org/wiki/Special:FilePath/Cyklometr.jpg?width=200 "Reconstruction of appearance of cyclometer, based on sketches in [[Marian Rejewski]]'s memoirs")
![[[Enigma machine]] – an electro-mechanical [[rotor machine]] with scrambler comprising (right to left) entry drum, three rotors, reflector. A modified version was adopted later in 1920s by German military.](https://commons.wikimedia.org/wiki/Special:FilePath/EnigmaMachineLabeled.jpg?width=200 "[[Enigma machine]] – an electro-mechanical [[rotor machine]] with scrambler comprising (right to left) entry drum, three rotors, reflector. A modified version was adopted later in 1920s by German military.")
![[[Marian Rejewski]], ca. 1932](https://commons.wikimedia.org/wiki/Special:FilePath/Marian Rejewski 1932 small.jpg?width=200 "[[Marian Rejewski]], ca. 1932")
CRYPTOLOGIC DEVICE
·noun A contrivance for recording the revolutions of a wheel, as of a bicycle.
Cyclometer
CRYPTOLOGIC DEVICE
The cyclometer was a cryptologic device designed, "probably in 1934 or 1935," by Marian Rejewski of the Polish Cipher Bureau's German section (BS-4) to facilitate decryption of German Enigma ciphertext.Marian Rejewski, "Summary of Our Methods for Reconstructing ENIGMA and Reconstructing Daily Keys...
cyclometer
CRYPTOLOGIC DEVICE
[s??'kl?m?t?]
¦ noun
1. an instrument for measuring circular arcs.
2. an instrument attached to a bicycle for measuring distance.
